I am not a fan of DRM simply because I believe in fair use of the media that I own. There should not be restriction to how I want to consume the source, whether I convert it from disc to .iso or directly to a playable media format supported by my OS of choice. Also, if I purchase any physical media I should not be required to connect to the Internet via any means to validate/register my product. This part, in particular, bothers me because I perform my own hardware upgrades and do not want the files/programs bound to one computer.